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1592025400 – Vers. 1.0 - 37 -
7. THE ISAGRAF WORKBENCH
7.1 Definitions
Before to start with the examples is important to fix some important definitions.
Resource: it is your project; inside there are the elements of your project.
The elements of your project are:
Programs: it is the software that you develop to execute your application.
In this picture, for every PLC Cycle, iPRO executes
the programs: Read_Inputs Æ Regulator_status_of_controller
Æ Regulator _Fans Æ ……
The number and the order of the programs depend on
your software.
PLC Cycle: it is the time that synchronize the execution of
the programs. For every PLC cycle, iPRO executes
the list of the program.
It is important to define this value considering that the CT must be:
• NEVER = 0ms (zero ms)
• ALWAYS compare the Current Cycle Time (CCT) and the Programmed
Cycle Time (PCT) with the following rule:
PCT > (2 x CCT)
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